Construction of Complex Co₃O₄@Co₃V₂O₈ Hollow Structures from Metal–Organic Frameworks with Enhanced Lithium Storage Properties

A novel metal–organic‐framework‐engaged strategy is demonstrated for the preparation of multishelled Co 3 O 4 @Co 3 V 2 O 8 hybrid nanoboxes. This strategy relies on the unique reaction of zeolitic imidazolate framework‐67 with the vanadium source of vanadium oxytriisopropoxide. Benefitting from the synthetic versatility, a series of nanostructures can be realized including triple‐shelled and double‐shelled Co 3 O 4 @Co 3 V 2 O 8 nanoboxes and single‐shelled Co 3 V 2 O 8 nanoboxes. When evaluated as electrode materials for lithium‐ion batteries, these unique hollow structures demonstrate remarkable lithium storage properties. For example, the triple‐shelled Co 3 O 4 @Co 3 V 2 O 8 nanoboxes retain a high capacity of 948 mAh g −1 after 100 cycles at 100 mA g −1 .